Add comment explaining BpBinder::linkToDeath invalid operation

Test: none
Bug: none
Change-Id: I5e55018314079b895084d2ae06a197b9d9e54480

1 files changed, 3 insertions, 0 deletions

diff --git a/libs/binder/Binder.cpp b/libs/binder/Binder.cpp
index bc7ae37ff0..9883eb2672 100644
--- a/libs/binder/Binder.cpp
+++ b/libs/binder/Binder.cpp
@@ -445,6 +445,9 @@ status_t BBinder::linkToDeath(
     const sp<DeathRecipient>& /*recipient*/, void* /*cookie*/,
     uint32_t /*flags*/)
 {
+    // BBinder::linkToDeath is invalid because this process owns this binder.
+    // The DeathRecipient is called on BpBinders when the process owning the
+    // binder node dies.
     return INVALID_OPERATION;
 }